An analogue tachograph must be recalibrated at what interval?

• A. Every four years
• B. Every eight years
• C. Every two years
• D. Every six years

Answer: (D)

The key idea here is how often an analogue tachograph must be checked and re-calibrated to keep the recorded data legally reliable. Analogue tachographs rely on mechanical components for the time base and speed input, which drift only slowly. Because of this, regulations set a longer maintenance interval: every six years. A service point with the proper approvals will perform the calibration, verify the time base and speed readings, and replace any necessary seals to ensure the device’s records remain accurate for legal use. If there’s suspicion of fault or tampering, recalibration should be done sooner, but the standard interval for an analogue unit is six years.